I think we can do a roll call for the 1858 chronograph Tachymeter both in steel with blue dial as well as red gold with black dial 
As for the 1858 manual small second, agree the movement could have been a more interesting one. The huge balance wheel on the Unitas movement is also quite cool but the finishing is very industrial I must admit
On the 2 versions of the 1858 Manual Small Second on strap, the first from left is the regular production edition. Third from left is the LE 858 pieces with a more vintage looking patina lume (creamy and yellow lume vs the more whitish lume on the regular edition)
Cheers
Robin